Is the nicotine content of a cigarette related to the "tar"? A collection of data (in milligrams) on 29 cigarettes produced the scatterplot, residuals plot, and regression analysis shown:

Dependent variable is Nicotine
R-squared = 92.4%
Variable Coefficient
Constant ………… 0.154030
Tar ………………. 0.065052
a) Do you think a linear model is appropriate here? Explain.
b) Explain the meaning of R2 in this context.